Yes, but did we invade an annex a portion of Mexico?
an = and
According to the “Reconquista” crowd, we absolutely did.
Not recently.
Actually, we did. We invaded Mexico in a two year war between 1846-8, occupied the capital of Mexico City, and dictated the Treaty of Guadalupe Hidalgo to the vanquished Mexican government. By its terms, we "bought" California, Arizona, New Mexico, Nevada, Utah and Colorado for a total price of $18,250,000. That's the way of the world, but at least we paid. Unfortunately, recent US administrations have been giving much of those territories back to Mexico through unchecked immigration.
This would be comical were the little islamist not in power.
Treaty of Guadalupe Hidalgo.